How do you prevent Guetzli from running twice on the same file

[FredWahl]

It seems loke a bad idea to run guetzli twice on the same picture. Is this something that Guetzli can detect by itself?

[FredWahl]

If you have lots of pictures and you decide to run guetzli on every jpg larger than, say, 8mb, youd append the string ”-guetzli” to the name which you then check for. What you get might still be larger than the threshold value. That solves the problem of course but I want to know if you can find out by examining the file. After all, you may have something for which guetzli has ben run like somethim from the james webb telescope.